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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Not an issue
Math.round does not work because it would return the wrong answer
3.9 cm should return 3 not 4 since only 3 whole cm were traveled.
The instructions do say floored in paranthesis
Math.round does not work but Math.floor work.
In the instructions, does not say that should be only down